Topic is named like that for easier search.

I re-did the excel sheet, originally done by W1SH. The "from" values stated in the latest patch changes list (from x to y) were always consistent with what I found in this table so I assume it indeed reflects the state of the T4 fighter planes before the patch. With small but important changes they now became T5s.

Here is a clickable pic leading to my spreadsheet:

 

I only looked at the fighter planes and only at the higher level ones that matter for the long grind to CV6 and for HA performance: T4 and T5. Numbers speak for themselves, so feel free to interpret the table as you wish.

Still, some personal comments by Dr. Obvious - first on the top-dog planes - now T5, previously T4:
- US gets a nerf only in attack. Still best defense, speed, fuel, sight
- UK gets some fighting chance with highest durability and defense being second best
- KM aren's slowest any more, which make them even more attractive
- IJN get no changes in terms of strengths or weaknesses relative to other nations
- MN gets a relative increase in speed. Still second best power and all else mediocre
- SN get a relative nerf: from second fastest now slowest. Still best defense and best power 
- RM get a nerf relative to other nations: speed from mediocre to slowest, fuel from second best to mediocre

Comments on the newly introduced T4 level 100 fighter planes:
- hopefully no more US domination with still best speed but now lowest attack power. Still most "best" stats of all nations (4 out of 6 best)
- UK a lot better balanced with second best durability and defense making them the tanks in the sky they were always supposed to be
- KM keep the good stat combination they always had: best attack but lowest durability. Highest defense prevents them from being paperplanes with heavy guns. Speed is slightly buffed relative to other nations, once lowest now being mediocre.
- IJN are the opposite of KM kinda: While having worst defense and attack power they are not the typical killer but the typical survivor with best speed, durability and fuel capacity guaranteeing long life in the air.
- MN remain mediocre (not best but definitely not worst in almost every stat). The cool thing here is that the stats that matter most for killing other planes are second best: speed and power. Interesting nation to play as well. Only nation with no "worst" stat.
- SN has best attack. Good defensive stats: best defense and a mediocre durability. Lowest speed means don't drag to run away because you can't. Drag to kill with the decent offensive and defensive stats the plane has.
- RM looks like US: everywhere US has best stats RM has second best: defense, speed, fuel, sight. Both have lowest attack power but the RM plane is more durable.

If I have some mistakes in the table let me know. The last thing I want is to deceive people :).

Have fun with the newly balanced planes. I know I will!!!